几何体

引擎内置了近二十种几何体，每个几何体外形均可通过参数配置，外形参数主要包括geometry、material，本节主要列出了几何体创建时的默认参数。

基础几何体在三维开发应用中使用的频率并不高，三维应用的场景基础物体大部分是模型对象，基础几何体常用来做一些辅助的功能。

Box 方体

new VT.Box({
    name: "Box",
    geometry: {
        width: 1,
        height: 1,
        depth: 1,
        widthSegments: 1,
        heightSegments: 1,
        depthSegments: 1,
    },
});

Capsule 胶囊体

new VT.Capsule({
    name: "Capsule",
    geometry: {
        radius: 0.5,
        height: 1.0,
        segments: 30,
        phiStart: 0,
        phiLength: Math.PI * 2,
    }
});

Cone 圆锥体

new VT.Cone({
    name: "Cone",
    geometry: {
        radius: 1,
        height: 1,
        radialSegments: 20,
        heightSegments: 1,
        openEnded: false,
        thetaStart: 0,
        thetaLength: 2 * Math.PI,
    }
});

Cylinder 圆柱体

new VT.Cylinder({
    name: "Cylinder",
    geometry: {
        radiusTop: 1,
        radiusBottom: 1,
        radialSegments: 30,
        height: 1,
        heightSegments: 1,
        openEnded: false,
        thetaStart: 0,
        thetaLength: 2 * Math.PI,
    }
});

Dodecahedron 十二面体

new VT.Dodecahedron({
    name: "Dodecahedron",
    geometry: {
        radius: 0.5,
        detail: 0,
    }
});

Doughnut 环形

new VT.Doughnut({
    name: "Doughnut",
    geometry: {
        radius: 1,
        innerRadius: 0.5,
        segments: 30,
        phiStart: 0,
        phiLength: Math.PI * 2,
    }
})

Icosahedron 二十面体

new VT.Icosahedron({
    name: "Icosahedron",
    geometry: {
        radius: 0.5,
        detail: 0,
    }
});

Lathe 车削体

new VT.Lathe({
      name: "Lathe",
      geometry: {
        points: [
          {
            "x": 0,
            "y": 0.5
          },
          {
            "x": 0.5,
            "y": 0
          },
          {
            "x": 0,
            "y": -0.5
          }
        ],
        segments: 12,
        phiStart: 0,
        phiLength: 2 * Math.PI,
      },
})

Octahedron 八面体

new VT.Octahedron({
    name: "Octahedron",
    geometry: {
        radius: 0.5,
        detail: 0,
    },
});

Plane 平面

new VT.Plane({
    name: "Plane",
    geometry: {
        width: 1,
        height: 1,
        widthSegments: 1,
        heightSegments: 1,
    },
})

Circle 圆形

new VT.Circle({
    name: "circle",
    geometry: {
        radius: 0.5,
        segments: 30, // 最小值为3
        thetaStart: 0,
        thetaLength: 2 * Math.PI,
    }
});

Sphere 球形

new VT.Sphere({
    name: "Sphere",
    geometry: {
        radius: 0.5,
        widthSegments: 30,
        heightSegments: 30,
        phiStart: 0,
        phiLength: Math.PI * 2,
        thetaStart: 0,
        thetaLength: Math.PI,
    },
});

Ring 环形

new VT.Ring({
    name: "Ring",
    geometry: {
        innerRadius: 0.4,
        outerRadius: 0.5,
        thetaSegments: 30,  // 最小为3
        phiSegments: 30,
        thetaStart: 0,
        thetaLength: Math.PI * 2
    },
});

Tetrahedron 四面体

new VT.Tetrahedron({
    name: "Tetrahedron",
    geometry: {
        radius: 0.5,
        detail: 0,
    },
});

Torus 环面

new VT.Torus({
    name: "Torus",
    geometry: {
        radius: 0.5,
        tube: 0.25,
        radialSegments: 16,
        tubularSegments: 16,
        arc: Math.PI * 2
    },
});

TorusKnot 环面纽结

new VT.TorusKnot({
    name: "TorusKnot",
    geometry: {
        radius: 0.5,
        tube: 0.2,
        tubularSegments: 64,
        radialSegments: 8,
        p: 2, // 这个值决定了几何体将绕着其旋转对称轴旋转多少次，默认值是2。
        q: 3 //  这个值决定了几何体将绕着其内部圆环旋转多少次，默认值是3。
    }
});

CannedLiquid 罐装体

new VT.CannedLiquid({
    name: "CannedLiquid",
    geometry: {
        radius: 0.5,
        height: 1.0,
        segments: 30,
        phiStart: 0,
        phiLength: Math.PI * 2,
        ratio: 1,
        clip: true,
        header: true,
        body: true,
        footer: true,
    },
    material: {
        side: 2,
        transparent: true,
        opacity: 0.95,
        color: "#29C4F5"
    }
})